EP3760949B1 - Wärmetauschereinheit und klimaanlage damit - Google Patents

Wärmetauschereinheit und klimaanlage damit Download PDF

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Publication number
EP3760949B1
EP3760949B1 EP19760689.0A EP19760689A EP3760949B1 EP 3760949 B1 EP3760949 B1 EP 3760949B1 EP 19760689 A EP19760689 A EP 19760689A EP 3760949 B1 EP3760949 B1 EP 3760949B1
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EP
European Patent Office
Prior art keywords
pipe
heat exchanger
refrigerant
heat exchangers
flow channel
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EP19760689.0A
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English (en)
French (fr)
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EP3760949A1 (de
EP3760949A4 (de
Inventor
Takuya Okumura
Kazuhiko Marumoto
Noriaki Yamamoto
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Panasonic Intellectual Property Management Co Ltd
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Panasonic Intellectual Property Management Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
    • F28D1/0408—Multi-circuit heat exchangers, e.g. integrating different heat exchange sections in the same unit or heat exchangers for more than two fluids
    • F28D1/0417—Multi-circuit heat exchangers, e.g. integrating different heat exchange sections in the same unit or heat exchangers for more than two fluids with particular circuits for the same heat exchange medium, e.g. with the heat exchange medium flowing through sections having different heat exchange capacities or for heating/cooling the heat exchange medium at different temperatures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0007—Indoor units, e.g. fan coil units
    • F24F1/0059—Indoor units, e.g. fan coil units characterised by heat exchangers
    • F24F1/0067—Indoor units, e.g. fan coil units characterised by heat exchangers by the shape of the heat exchangers or of parts thereof, e.g. of their fins
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/40—Fluid line arrangements
    • F25B41/42—Arrangements for diverging or converging flows, e.g. branch lines or junctions
    • F25B41/45—Arrangements for diverging or converging flows, e.g. branch lines or junctions for flow control on the upstream side of the diverging point, e.g. with spiral structure for generating turbulence
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/40—Fluid line arrangements
    • F25B41/42—Arrangements for diverging or converging flows, e.g. branch lines or junctions
    • F25B41/48—Arrangements for diverging or converging flows, e.g. branch lines or junctions for flow path resistance control on the downstream side of the diverging point, e.g. by an orifice
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/03—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with plate-like or laminated conduits
    • F28D1/0308—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with plate-like or laminated conduits the conduits being formed by paired plates touching each other
    • F28D1/0325—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with plate-like or laminated conduits the conduits being formed by paired plates touching each other the plates having lateral openings therein for circulation of the heat-exchange medium from one conduit to another
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
    • F28F3/02—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations
    • F28F3/04—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being integral with the element
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/26—Arrangements for connecting different sections of heat-exchange elements, e.g. of radiators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B39/00—Evaporators; Condensers
    • F25B39/02—Evaporators
    • F25B39/028—Evaporators having distributing means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B39/00—Evaporators; Condensers
    • F25B39/04—Condensers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
    • F28D2021/0068—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for refrigerant cycles

Definitions

  • the present disclosure relates to a heat exchanger unit configured of a plurality of heat exchangers connected in parallel, and an air conditioner using the same.
  • the present invention relates to a heat exchanger unit suitable for a case where the heat exchangers are plate fin stacked-type heat exchangers, and an air conditioner using the same.
  • the present disclosure relates to a heat exchanger unit as defined in the preamble of claim 1, and as illustrated in EP 3 141 825 .
  • an air conditioner performs cooling or heating by circulating refrigerant, compressed by a compressor, through a heat exchanger such as a condenser and an evaporator to exchange heat with air.
  • a heat exchanger in addition to a case where one heat exchanger is used alone, a unit obtained by combining a plurality of heat exchangers may be used. In such a case, it is preferable to make refrigerant almost uniformly flow through respective heat exchangers so that the heat exchange efficiencies of the respective heat exchangers become almost the same.
  • a conventional heat exchanger unit is configured such that refrigerant is distributed via a distributor and the refrigerant is supplied to the heat exchangers almost equally (for example, see Patent Literature 1).
  • FIG. 13 shows a schematic configuration of a conventional heat exchanger unit described in Patent Literature 1.
  • Three heat exchangers 101 are connected in parallel, and distributor 102 is provided at a refrigerant branch portion. Further, flow rate adjuster 103 is provided between distributor 102 and an inlet pipe portion of heat exchanger 101 on the downstream side thereof. Then, refrigerant is distributed by distributor 102. Then, flow rate adjuster 103 adjusts the flow rate of the refrigerant, that is, a loss of pressure (hereinafter, referred to as a pressure loss), and the refrigerant is supplied to respective heat exchangers 101.
  • a pressure loss a loss of pressure
  • the refrigerant is supplied to respective heat exchangers 101 almost uniformly.
  • a flow rate of the refrigerant distributed by distributor 102 is adjusted by flow rate adjuster 103 and the refrigerant flows into respective heat exchangers 101.
  • a pressure loss of each outlet pipe is different, a degree of dryness at an inlet port varies between a plurality of heat exchangers 101, resulting in a difference in the distributed amount. Therefore, the refrigerant may not be equally distributed to the heat exchangers. That is, if flow rate adjustment, in other words, pressure loss adjustment, is performed at the heat exchanger inlet portion by flow rate adjuster 103, equalization of distribution is improved as compared with a case where the pressure loss adjustment is not performed. However, a degree of equalization of the distribution is still insufficient, and there is room for improvement.
  • the present disclosure provides a heat exchanger unit that improves a degree of equalization when refrigerant is distributed to a plurality of heat exchangers and exhibits good heat exchange performance, and a high-performance air conditioner using the same.
  • a heat exchanger unit of the present disclosure is a heat exchanger unit including a plurality of heat exchangers.
  • Each of the plurality of the heat exchangers includes a first pipe into which refrigerant flows, a first header flow channel that communicates with an outflow side of the first pipe, a second header flow channel disposed downstream of the first header flow channel, a plurality of refrigerant flow channels that allow the first header flow channel and the second header flow channel to communicate with each other, and a second pipe that communicates with an outflow side of the second header flow channel.
  • the heat exchanger unit also includes a distribution part that distributes the refrigerant to the first pipe in each of the plurality of the heat exchangers, a merging part that merges the refrigerant from the second pipe in each of the plurality of the heat exchangers, a first flow rate adjuster provided to the first pipe in at least one of the plurality of the heat exchangers, and a second flow rate adjuster provided to the second pipe in at least one of the plurality of the heat exchangers.
  • the inventors of the present invention have earnestly studied distribution of refrigerant to a plurality of heat exchangers, and have obtained the following knowledge.
  • a plate fin stacked-type heat exchanger As one of multi-pass small-diameter heat exchangers, for example, there is a plate fin stacked-type heat exchanger.
  • a diameter of a heat transfer path between a header at an inlet portion and a header at an outlet portion can be easily reduced, and a number of heat transfer channels (a number of paths) can be increased. Therefore, when it is used as an indoor heat exchanger of an air conditioner, a great advantageous effect can be obtained.
  • the inventors of the present invention connect a plurality of the plate fin stacked-type heat exchangers in parallel, provide a flow rate adjuster on an inlet side of each heat exchanger so as to equalize the pressure loss of the inlet pipe between the plurality of heat exchangers, if the pressure loss is different between the heat exchangers due to a difference in the length of outlet pipes or the like, it is not possible to realize uniform distribution of the refrigerant to the respective heat exchangers.
  • the inventors of the present invention have considered a cause as follows.
  • Patent Literature 1 when a heat exchanger unit in which a plurality of heat exchangers are combined is used as an outdoor unit, since a plurality of heat exchangers face different air outlets respectively, there is no problem even if the heat exchange efficiency is slightly different between the plurality of heat exchangers.
  • a heat exchanger unit in which a plurality of heat exchangers are combined in parallel is used to face one air outlet as an indoor unit, the difference in the heat exchange efficiency between the heat exchangers is directly linked to the difference in air temperature. Therefore, a user feels uncomfortable. Therefore, it is necessary to further increase the degree of equalization of distribution to the respective heat exchangers.
  • a heat exchanger unit is a heat exchanger unit including a plurality of heat exchangers.
  • Each of the plurality of the heat exchangers includes a first pipe into which refrigerant flows, a first header flow channel that communicates with an outflow side of the first pipe, a second header flow channel disposed downstream of the first header flow channel, a plurality of refrigerant flow channels that allow the first header flow channel and the second header flow channel to communicate with each other, and a second pipe that communicates with an outflow side of the second header flow channel.
  • the heat exchanger unit also includes a distribution part that distributes the refrigerant to the first pipe in each of the plurality of the heat exchangers, a merging part that merges the refrigerant from the second pipe in each of the plurality of the heat exchangers, a first flow rate adjuster provided to the first pipe of at least one of the plurality of the heat exchangers, and a second flow rate adjuster provided to the second pipe of at least one of the plurality of the heat exchangers.
  • the refrigerant can be distributed to respective heat exchangers by making the degree of dryness and the circulation amount of the refrigerant equal. Therefore, the degree of equalization of branch flows of the refrigerant between the heat exchangers can be increased. In other words, the heat exchange performance of the entire heat exchanger unit can be improved by ensuring equal distribution of the refrigerant to the respective heat exchangers to thereby equalize the heat exchange efficiency.
  • each of the plurality of the heat exchangers is a plate fin stacked-type heat exchanger including a plurality of plate fins.
  • Each of the plurality of the plate fins includes two plate members stacked, and the plurality of the refrigerant flow channels are formed of a dented groove formed on at least one of the two plate members.
  • Each of the plurality of the plate fins may have a header region in which at least one of the first header flow channel and the second header flow channel is arranged.
  • a heat exchanger unit may have a configuration in which a distributor is provided to a distribution part for the refrigerant.
  • the refrigerant can be distributed substantially evenly to a plurality of the heat exchangers connected in parallel, and the heat exchange efficiency of the entire heat exchanger unit can be improved.
  • a heat exchanger unit may have a configuration in which a branch pipe is provided to a distribution part for refrigerant, and a throttle pipe having a pipe diameter smaller than a pipe diameter at an inlet port of the branch pipe is provided upstream of the branch pipe.
  • the flow velocity of the refrigerant is accelerated by the throttle pipe, and the refrigerant acts so that the flow of the refrigerant immediately after the throttle pipe becomes an annular flow. Therefore, since such refrigerant flows from the inlet port of the branch pipe, the refrigerant can be distributed with substantially the same gas-liquid balance and supplied to the respective heat exchangers. Therefore, the heat exchange efficiency of the respective heat exchangers can be made substantially uniform, and the heat exchange efficiency of the entire heat exchanger unit can be made good.
  • An air conditioner according to an aspect of the present disclosure is an air conditioner including an indoor unit and an outdoor unit. At least one of the indoor unit and the outdoor unit has the heat exchanger unit described above.
  • the indoor unit includes a housing, a heat exchanger unit disposed in the housing, an air passage configured in the housing, and an air outlet disposed at an outlet port of the air passage. Then, a plurality of the heat exchangers of the heat exchanger unit may be configured to be arranged side by side in an air passage along a first direction across the air passage.
  • the temperature of the air blown out of the air outlet of the indoor unit can be made substantially uniform. Therefore, it is possible to obtain a highefficiency and high-quality air conditioner in which the heat exchange performance is improved by using a fin-stacked heat exchanger having high heat exchange efficiency and the temperature unevenness of the air from the air outlet is small.
  • the distribution part and the merging part are disposed outside one end of the plurality of the heat exchangers arranged side by side in the first direction, and in each of the plurality of the heat exchangers, the first pipe and the second pipe are disposed in a projection range of a header region projected to a plane perpendicular to a direction of air flowing through the air passage, or a plane which is vertical and is parallel to the first direction.
  • the first pipe and the second pipe connected to the upstream header flow channel and the downstream header flow channel of the heat exchanger, located on the opposite side away from the merging part, cross the air passage.
  • the first pipe and the second pipe that cross the air passage are located in a header region where at least one of the upstream header flow channel and the downstream header flow channel of the heat exchanger is provided and that is not subjected to heat exchange. For this reason, it is possible to suppress a decrease in the heat exchange efficiency due to the first pipe and the second pipe crossing the air passage. Therefore, a high-performance air conditioner with high energy saving property can be obtained by utilizing the high heat exchange efficiency of the heat exchanger.
  • a plate fin stacked-type heat exchanger to which the present disclosure is most effectively applied will be described as an example.
  • the present disclosure is not limited to this.
  • a configuration of a heat exchanger equivalent to a technical idea described in exemplary embodiments provided below is also included.
  • FIG. 1 is a diagram illustrating a schematic configuration of a heat exchanger unit according to a first exemplary embodiment of the present disclosure.
  • heat exchanger unit 100 of the present exemplary embodiment includes a plurality of heat exchangers 1 (in the present exemplary embodiment, two heat exchangers 1a, 1b). Heat exchangers 1a, 1b are arranged side by side in a left-right direction (first direction) in FIG 1 .
  • Each of heat exchangers 1a, 1b includes first header flow channel 28, second header flow channel 29 disposed downstream of the first header flow channel, and a plurality of refrigerant flow channels 31 that allow the first header flow channel and the second header flow channel to communicate with each other, as described below (see FIG. 3 ).
  • heat exchangers 1a, 1b have inflow pipes 6a, 6b communicating with first header flow channel 28 (see FIG. 3 ) via inlet pipes 2a, 2b, respectively. Further, heat exchangers 1a, 1b have outflow pipes 7a, 7b communicating with second header flow channel 29 (see FIG. 3 ) via outlet pipes 3a, 3b, respectively.
  • Inlet pipe 2a and inflow pipe 6a, and inlet pipe 2b and inflow pipe 6b constitute first pipes in heat exchangers 1a, 1b, respectively.
  • Outlet pipe 3a and outflow pipe 7a, and outlet pipe 3b and outflow pipe 7b constitute second pipes in heat exchangers 1a, 1b, respectively.
  • Heat exchanger unit 100 also includes distributer (distribution part) 4 that distributes refrigerant to first pipes 6a, 6b in heat exchangers 1a, 1b, respectively, and merging unit (merging part) 5 that merges refrigerant from second pipes 7a, 7b in heat exchangers 1a, 1b, respectively.
  • distributer distributed part
  • merging unit merging part
  • refrigerant circuits of heat exchangers 1a, 1b are connected to each other in parallel.
  • refrigerant is distributed by distributer 4 and flows into first pipes 6a, 6b, and the refrigerant flowing through second pipes 7a, 7b are merged by merging unit 5.
  • the refrigerant is supplied from main pipe 70 to heat exchanger unit 100, flows out of heat exchanger unit 100, and returns to main pipe 70.
  • heat exchangers 1a, 1b are configured to be symmetric to each other with respect to a boundary portion, that is, to have a mirror image relationship.
  • flow rate adjuster 81 is provided to the first pipe of at least one of a plurality of heat exchangers 1a, 1b. Further, flow rate adjuster 82 is provided to the second pipe of at least one of a plurality of heat exchangers 1a, 1b. That is, heat exchanger unit 100 is provided with at least one flow rate adjuster on both the upstream side and the downstream side of heat exchanger 1.
  • flow rate adjuster 81 and flow rate adjuster 82 are provided to inflow pipe 6 and outflow pipe 7, respectively, of a heat exchanger, of heat exchangers 1a, 1b, having a smaller pressure loss from the distributer 4 to the merging unit 5 including the heat exchanger.
  • the pressure loss of heat exchanger 1b on the right side is smaller than the pressure loss of heat exchanger 1a on the left side. Therefore, flow rate adjuster 81 is provided to inflow pipe 6b and flow rate adjuster 82 is provided to outflow pipe 7b of heat exchanger 1b on the right side.
  • Flow rate adjuster 81 is configured of, for example, a small-diameter pipe having a pipe diameter smaller than a pipe diameter of inflow pipe 6.
  • flow rate adjuster 82 is configured of, for example, a small-diameter pipe having a pipe diameter smaller than a pipe diameter of outflow pipe 7.
  • Flow rate adjuster 81 is configured such that respective pipe pressure losses in inlet pipes 2a, 2b, from two left and right heat exchangers 1a, 1b to distributer 4, are substantially equal.
  • flow rate adjuster 82 is configured such that respective pipe pressure losses in outlet pipes 3a, 3b, from two left and right heat exchangers 1a, 1b to merging unit 5, are substantially equal.
  • flow rate adjuster 81 may be configured of a large diameter pipe having a pipe diameter larger than a pipe diameter of inflow pipe 6 so that pipe pressures in inlet pipes 2a, 2b from heat exchangers 1a, 1b to merging unit 5 are substantially equal.
  • flow rate adjuster 82 may be configured of a large diameter pipe having a pipe diameter larger than a pipe diameter of outflow pipe 7 so that pipe pressure losses in outlet pipes 3a, 3b from heat exchangers 1a, 1b to merging unit 5 are substantially equal. That is, for the first pipe and the second pipe, flow rate adjuster 81 and flow rate adjuster 82 each can be configured by making a pipe diameter in one part different from a pipe diameter in another part.
  • flow rate adjuster 81 and flow rate adjuster 82 are provided only to a heat exchanger, of a plurality of heat exchangers 1a, 1b, in which a pressure loss from distributer 4 to merging unit 5 including heat exchangers 1a, 1b is smaller.
  • flow rate adjuster 81 and flow rate adjuster 82 may be provided to inflow pipes 6a, 6b and outflow pipes 7a, 7b of respective heat exchangers 1a, 1b. That is, the pressure loss may be adjusted for each of a plurality of heat exchangers 1a, 1b.
  • FIG. 2 is an exploded perspective view of a heat exchanger of the heat exchanger unit in FIG. 1 as viewed from below.
  • heat exchanger 1 (1a, 1b) of heat exchanger unit 100 is a plate fin stacked-type heat exchanger.
  • heat exchanger 1 includes a plate fin stacked body 22 formed by stacking a plurality of plate fins 21, inlet pipe 2 serving as an inlet port for refrigerant, and outlet pipe 3 serving as an outlet port for refrigerant.
  • inlet pipe 2 and outlet pipe 3 directions in which refrigerant flows in and out are reversed between a case where heat exchangers 1a and 1b are used as evaporators and a case where they are used as condensers.
  • heat exchangers 1a and 1b are used as evaporators. Therefore, description will be given by specifying that inlet pipes 2a, 2b are the first pipes and outlet pipes 3a, 3b are the second pipes.
  • Plate fin 21 has a rectangular plate shape. End plates 23 and 24 are provided on both sides (left side and right side in FIG. 2 ) in a stacking direction of plate fin stacked body 22. Each of end plates 23, 24 is formed of a flat plate. A shape of end plate 23, 24 in plan view is substantially the same as a shape of plate fin 21 in plan view shown in FIG. 3 . End plate 23, 24 is formed of a rigid plate material. End plate 23, 24 is formed by, for example, metal working of a metal material such as aluminum, an aluminum alloy, and stainless steel by grinding.
  • End plates 23, 24 and a plurality of plate fins 21 are joined and integrated by brazing in a state where they are stacked.
  • each of end plates 23, 24 on both sides of plate fin stacked body 22 is connected to and fixed to plate fin stacked body 22 by connection means 25 such as a bolt and a nut or a caulking pin shaft.
  • Connection means 25 connects end plates 23, 24 to plate fin stacked body 22 at both ends in a longitudinal direction of end plates 23, 24 in plan view. That is, end plates 23, 24 on both sides of plate fin stacked body 22 are mechanically connected to and fixed to plate fin stacked body 22 while sandwiching plate fin stacked body 22.
  • FIG. 3 is a plan view of plate fins constituting a heat exchanger of the heat exchanger unit in FIG. 1 .
  • FIG. 4 is an exploded perspective view showing a part of the plate fin in FIG. 3 in an enlarged manner.
  • plate fin 21 has refrigerant flow channel 31.
  • Refrigerant flow channel 31 is configured of a plurality of refrigerant flow channels (first refrigerant flow channel 31a and second refrigerant flow channel 31b) that are arranged in parallel with each other and through which refrigerant as a first fluid flows. That is, refrigerant flow channel 31 is configured of a group of first refrigerant flow channels 31a and second refrigerant flow channels 31b.
  • Refrigerant flow channel 31 is disposed in a substantially U shape. Specifically, in FIG.
  • refrigerant flows from the left side to the right side in first refrigerant flow channel 31a, turns back at the right end, and flows from the right side to the left side in second refrigerant flow channel 31b.
  • Inlet pipe 2 and outlet pipe 3 connected thereto are collectively disposed on one end side in a longitudinal direction of end plate 23a on one side (the right side in FIG. 2 ) of plate fin stacked body 22.
  • plate fin 21 has a plurality of heat transfer channels (hereinafter, referred to as refrigerant flow channels 31) arranged in parallel.
  • Refrigerant flow channel 31 is connected to upstream header flow channel (first header flow channel) 28 and downstream header flow channel (second header flow channel) 29.
  • Upstream header flow channel 28 and downstream header flow channel 29, connected to a plurality of refrigerant flow channels 31, are collectively disposed on one end side in the longitudinal direction of plate fin 21.
  • Upstream header flow channel 28 and downstream header flow channel 29 may be arranged separately on both ends in the longitudinal direction of plate fin 21.
  • header region H a region where the header flow channel is disposed
  • flow channel region P a region where refrigerant flow channel 31 is disposed
  • Upstream header flow channel 28 serves as an inlet port for refrigerant when heat exchanger 1 is used as an evaporator, and serves as an outlet port for refrigerant when heat exchanger 1 is used as a condenser.
  • downstream header flow channel 29 is opposite. That is, when heat exchanger 1 is used as an evaporator, downstream header flow channel 29 serves as an outlet port for refrigerant, and when heat exchanger 1 is used as a condenser, downstream header flow channel 29 serves as an inlet port for refrigerant.
  • plate fin 21 is configured such that a pair of first plate member 26a and second plate member 26b are disposed to face each other and joined to each other by brazing.
  • a plurality of refrigerant flow channels 31 are formed in a substantially U-shape as described above.
  • FIG. 5 is a perspective view showing a cross section of a refrigerant flow channel portion in a heat exchanger of the heat exchanger unit in FIG. 1 .
  • FIG. 6 is a perspective view showing a cross section of a header flow channel portion of the heat exchanger in FIG. 5 .
  • a large number of the plate fins 21 are stacked to form a plate fin stacked body 22 that is a main body of heat exchanger 1.
  • Plate fin 21 is provided with a plurality of protrusions 27 (see FIG. 3 ) as appropriate at both ends in the longitudinal direction of plate fin 21 in plan view and between refrigerant flow channels 31.
  • Gap d (see FIGS. 5 and 6 ) is formed between plate fins 21 by a plurality of protrusions 27, and air as a second fluid flows through gap d.
  • Refrigerant flow channel 31 is formed of dented grooves formed in first plate member 26a and second plate member 26b. Therefore, a diameter of refrigerant flow channel 31 can be easily reduced. Note that refrigerant flow channel 31 may be configured of a dented groove provided in at least one of first plate member 26a and second plate member 26b.
  • refrigerant flow channel 31 includes upstream header flow channel-side refrigerant flow channel (first refrigerant flow channel) 31a connected to upstream header flow channel 28, and downstream header flow channel-side refrigerant flow channel (second refrigerant flow channel) 31b connected to downstream header flow channel 29.
  • first header flow channel 28 and first refrigerant flow channel 31a communicate with each other via passage 34a
  • second header flow channel 29 and second refrigerant flow channel 31b communicate with each other via passage 34b.
  • Slit groove 35 (see FIG. 3 ) is disposed between first refrigerant flow channel 31a and second refrigerant flow channel 31b. As shown in FIG. 3 , slit groove 35 extends from an end (left side in FIG. 3 ) of plate fin 21 on a side where upstream header flow channel 28 and downstream header flow channel 29 are disposed, to the vicinity of a folded portion of refrigerant flow channel 31. Slit groove 35 can prevent direct heat transfer between first refrigerant flow channel 31a and second refrigerant flow channel 31b.
  • second refrigerant flow channels 31b is larger than a number of first refrigerant flow channels 31a.
  • non-porous portion 36 is disposed at a portion of downstream header flow channel 29 facing passage 34b, and does not constitute a refrigerant flow channel.
  • heat exchangers 1a and 1b of heat exchanger unit 100 are used as evaporators.
  • Refrigerant that is the first fluid flows into heat exchangers 1a, 1b from inlet pipes 2a, 2b provided on the respective inlet sides (upstream sides) of heat exchangers 1a, 1b.
  • the refrigerant flows into first refrigerant flow channels 31a respectively provided to a plurality of plate fins 21 constituting plate fin stacked body 22 via upstream header flow channel 28.
  • the refrigerant flows through a plurality of first refrigerant flow channels 31a in parallel in the longitudinal direction, turns around in a U-turn, and flows through a plurality of second refrigerant flow channels 31b in parallel in the longitudinal direction. After that, the refrigerant flows through downstream header flow channel 29 and flows out through outlet pipes 3a, 3b provided on the outlet side (downstream side) of heat exchangers 1a, 1b.
  • heat exchangers 1a, 1b perform heat exchange between the refrigerant and the air. Further, the refrigerant is distributed by distributer 4 on the inlet side (upstream side) of heat exchanger 1, and supplied into heat exchangers 1a, 1b from two inlet pipes 2a, 2b, respectively. Then, the refrigerant that has passed through heat exchangers 1a, 1b is discharged from outlet pipes 3a, 3b, and is then merged by merging unit 5.
  • the refrigerant is distributed to respective heat exchangers.
  • the refrigerant flowing into heat exchangers 1a, 1b has the same degree of dryness. Further, it is desirable that the flow rate of the refrigerant flowing into each heat exchanger is equal.
  • pressure is adjusted by a flow rate adjuster provided only on the inlet pipe side, that is, on the upstream side of a heat exchanger.
  • a pressure loss in refrigerant flow channel 31 in the used heat exchanger is extremely small, the refrigerant flowing into the inlet pipe is affected by a difference in pipe pressure on the outlet pipe side (downstream side). Therefore, the degree of dryness of the refrigerant flowing into each heat exchanger is different for each heat exchanger. Therefore, the refrigerant cannot be distributed in such a manner that the flow rate of the refrigerant flowing into respective heat exchangers is equalized. That is, the degree of equalization at the time of distributing the inflow refrigerant is low, and the inflow refrigerant is not evenly distributed to respective heat exchangers.
  • flow rate adjuster 82 is provided not only on the upstream side of heat exchangers 1a and 1b, but also on the side of outlet pipes 3a, 3b (downstream side). That is, pressure is adjusted on both the inlet side and the outlet side of heat exchangers 1a, 1b. Thereby, the pressure loss on the inlet side of the heat exchangers 1a, 1b can be equalized, and also the pressure loss on the outlet side of the heat exchangers 1a, 1b can be equalized. Therefore, the state of refrigerant at each of the inlet ports of the heat exchangers 1a, 1b, that is, the degree of dryness of the refrigerant, can be made equal.
  • the refrigerant can be equally distributed to a plurality of heat exchangers 1a, 1b. That is, it is possible to distribute the refrigerant by greatly improving the equalization ratio of the distributed refrigerant, and allow the refrigerant to flow evenly into heat exchangers 1a, 1b.
  • the plate fin stacked-type heat exchanger exemplified in the present exemplary embodiment has a large number of first refrigerant flow channels 31a and second refrigerant flow channels 31b that connect upstream header flow channel 28 and downstream header flow channel 29 (a number of paths is large). Therefore, the pressure loss in entire refrigerant flow channel 31, that is, the internal pressure loss as a heat exchanger, is as low as about one tenth of the internal pressure loss of a fin tube-type heat exchanger.
  • flow rate adjuster 82 is also provided on the side of outlet pipes 3a, 3b (downstream side).
  • the pressure can be adjusted not only at the refrigerant inlet side but also at the outlet side. Therefore, not only the pressure loss on the inlet side of the heat exchangers 1a, 1b can be made equal but also the pressure loss on the outlet side can be made equal.
  • the degree of dryness of the refrigerant flowing into heat exchangers 1a, 1b can be made equal, so that the refrigerant can be evenly distributed to heat exchangers 1a, 1b.
  • heat exchange efficiency in heat exchangers 1a, 1b can be improved by reducing a diameter of refrigerant flow channel 31 between upstream header flow channel 28 and downstream header flow channel 29 and increasing a number of paths of refrigerant flow channel 31.
  • heat exchanger unit 100 of the present exemplary embodiment can distribute the refrigerant evenly to a plurality of pipes communicating with a plurality of heat exchangers 1a, 1b and allow the refrigerant to flow into heat exchangers 1a, 1b. Therefore, heat exchanger unit 100 having good heat exchange performance can be realized.
  • heat exchange unit 100 includes heat exchanger 1a and heat exchanger 1b, and includes a distributer 4 that is connected to main pipe 70 for supplying the refrigerant and distributes the refrigerant to first pipe 6a and first pipe 6b, a second pipe 7a that supplies the refrigerant supplied from heat exchanger 1a to main pipe 70, a second pipe 7b that supplies the refrigerant supplied from heat exchanger 1b to main pipe 70, and a merging unit 5 that is connected to second pipe 7a, second pipe 7b, and main pipe 70 and supplies the refrigerant supplied from second pipe 7a and second pipe 2b to main pipe 70.
  • a distributer 4 that is connected to main pipe 70 for supplying the refrigerant and distributes the refrigerant to first pipe 6a and first pipe 6b
  • a second pipe 7a that supplies the refrigerant supplied from heat exchanger 1a to main pipe 70
  • a second pipe 7b that supplies the refrigerant supplied from heat exchanger 1b to main pipe 70
  • First pipe 6a supplies the refrigerant distributed by distributer 4 to heat exchanger 1a
  • first pipe 6b supplies the refrigerant distributed by distributer 4 to heat exchanger 1b.
  • Heat exchanger 1a includes first header flow channel 28a and second header flow channel 29a
  • heat exchanger 1b includes first header flow channel 28a and second header flow channel 29b.
  • First pipe 6a is connected to first header flow channel 28a
  • first pipe 6b is connected to first header flow channel 28b
  • second pipe 7a is connected to second header flow channel 29a
  • second pipe 7b is connected to second header flow channel 29b.
  • First flow rate adjuster 81 is disposed on at least one of first pipe 6a and first pipe 6b, and second flow rate adjuster 82 is disposed on at least one of second pipe 7a and second pipe 7b.
  • Each of first flow rate adjuster 81 and second flow rate adjuster 82 adjusts the flow rate of the refrigerant flowing through the pipe.
  • first flow rate adjuster 81 and second flow rate adjuster 82 are adjusted so that the pressure losses on the inlet sides and the pressure losses on the outlet sides of respective heat exchangers 1a and 1b become equal, the refrigerant can be distributed to respective heat exchangers 1a, 1b with the degree of dryness and the amount of circulation of the refrigerant being equalized. Therefore, the degree of equalization of the distributed refrigerant between heat exchangers 1a, 1b can be increased. Accordingly, it is possible to improve the heat exchange performance of entire heat exchanger unit 100 by further ensuring equal distribution of the refrigerant to respective heat exchangers 1a, 1b and equalizing the heat exchange efficiency.
  • FIG. 7 is a diagram showing a schematic configuration of a heat exchanger unit according to a second exemplary embodiment of the present disclosure.
  • FIG. 8 is a diagram showing a schematic configuration of a portion indicated by "a" in FIG. 7 .
  • heat exchanger unit 110 of the present exemplary embodiment has a branch pipe 9 provided at an upstream portion of inlet pipes 2a and 2b of heat exchangers 1a and 1b, and has a configuration of distributing the refrigerant, flowing into heat exchanger unit 110, to heat exchangers 1a, 1b. Also, a throttle pipe 10 is provided on the inlet side (upstream side) of branch pipe 9.
  • heat exchangers 1a and 1b themselves are similar to those of the first exemplary embodiment, and the same parts are denoted by the same reference numerals and description thereof is omitted.
  • branch pipe 9 is provided to a distribution part for distributing the refrigerant to respective first pipes 6a, 6b of a plurality of heat exchangers 1a, 1b.
  • a Y branch pipe that branches into two is used as branch pipe 9.
  • throttle pipe 10 having a smaller pipe diameter than a pipe diameter of inlet pipe 9a at the inlet port of branch pipe 9 is provided.
  • the refrigerant flowing from inlet pipe 9a of branch pipe 9 is throttled by throttle pipe 10 located upstream thereof, the flow velocity is increased, and the refrigerant forms an annular flow. Therefore, in branch pipe 9 (Y branch pipe), the refrigerant can be evenly distributed. Therefore, refrigerant having substantially the same gas-liquid balance can be supplied to heat exchangers 1a, 1b. Accordingly, the heat exchange efficiency of heat exchangers 1a, 1b can be made substantially uniform, and the heat exchange efficiency of heat exchanger unit 110 as a whole can be made good.
  • branch pipe 9 is a Y-branch pipe, so that even when branch pipe 9 is installed in a slightly inclined state, the refrigerant is hardly affected by gravity when being distributed. Therefore, the refrigerant can be supplied to heat exchangers 1a, 1b without collapse of a gas-liquid separation ratio of the refrigerant that has been throttled by throttle pipe 10 and distributed by branch pipe 9. Thus, the heat exchange efficiency of each of heat exchangers 1a, 1b can be more reliably improved, and the heat exchange efficiency of heat exchanger unit 110 as a whole can be improved.
  • a distributor may be provided upstream of first pipes 6a, 6b.
  • the distributor With the distributor being provided, the refrigerant can be distributed substantially evenly to each of a plurality of heat exchangers 1a, 1b connected in parallel. Therefore, the heat exchange efficiency of heat exchanger unit 110 as a whole can be improved.
  • FIG. 9 is a refrigeration cycle diagram of an air conditioner according to a present third exemplary embodiment.
  • Air conditioner 200 of the present exemplary embodiment is configured by using any one of the heat exchanger units shown in the first and second exemplary embodiments.
  • air conditioner 200 includes outdoor unit 51 and indoor unit 52 connected to outdoor unit 51.
  • Outdoor unit 51 is provided with compressor 53 that compresses refrigerant, four-way valve 54 that switches a refrigerant circuit depending on a cooling operation and a heating operation, outdoor heat exchanger 55 that performs heat exchange between the refrigerant and external air, decompressor 56 that decompresses the refrigerant, and outdoor air blower 59.
  • Indoor unit 52 is provided with indoor heat exchanger 57 that performs heat exchange between the refrigerant and indoor air, and indoor air blower 58.
  • Compressor 53 four-way valve 54, indoor heat exchanger 57, decompressor 56, and outdoor heat exchanger 55 are connected to form a refrigerant circuit through which the refrigerant flows, thereby forming a heat pump refrigeration cycle.
  • FIG. 10 is a diagram showing a cross-sectional configuration of the indoor unit of the air conditioner according to the third exemplary embodiment when viewed from the right side.
  • FIG. 11 is a diagram showing a cross-sectional configuration of the indoor unit according to the third exemplary embodiment when viewed from above.
  • indoor heat exchanger 57 includes housing 64, heat exchanger unit 60 disposed in housing 64, and heat exchange air blowing passage (air passage) 62 configured in housing 64.
  • heat exchanger unit 60 any of heat exchanger units 100, 110 shown in the first and second exemplary embodiments is used.
  • Air outlet 61 is disposed at an outlet port of air passage 62.
  • suction port 63 is disposed at an inlet port of the air passage.
  • indoor heat exchanger 57 constituting heat exchanger unit 60 is disposed in air passage 62. Further, as shown in FIG. 11 , indoor heat exchanger 57 is configured such that heat exchangers 1a, 1b are arranged side by side in a first direction crossing air passage 62. In the present exemplary embodiment, indoor heat exchanger 57 is arranged to fill the width of air passage 62. Specifically, heat exchangers 1a, 1b are arranged side by side in the left-right direction in FIG. 11 so as to face one air outlet 61 in plan view of the indoor unit 52.
  • refrigerant in the refrigerant circuit of the present exemplary embodiment, as refrigerant, tetrafluoropropene or trifluoropropene, and difluoromethane, pentafluoroethane, or tetrafluoroethane can be used alone or as a mixture of two or three components, respectively.
  • Air conditioner 200 configured as described above switches operation between a cooling operation and a heating operation by switching the four-way valve.
  • four-way valve 54 is switched so that the discharge side of compressor 53 and outdoor heat exchanger 55 communicate with each other.
  • the refrigerant compressed by compressor 53 becomes high-temperature and high-pressure refrigerant and is sent to outdoor heat exchanger 55 through four-way valve 54.
  • the refrigerant exchanges heat with the external air to release heat and is condensed to become high-pressure liquid refrigerant, which is sent to decompressor 56.
  • the refrigerant is decompressed by decompressor 56 to become low-temperature and lowpressure two-phase refrigerant, which is sent to indoor unit 52.
  • the refrigerant flows into indoor heat exchanger 57.
  • the refrigerant exchanges heat with indoor air, thereby absorbing heat and evaporating to be low-temperature gas refrigerant.
  • the room air is cooled through each exchange with the refrigerant to cool the room.
  • the refrigerant flowing out of indoor heat exchanger 57 returns to outdoor unit 51, and returns to compressor 53 via four-way valve 54.
  • four-way valve 54 is switched so that the discharge side of compressor 53 and indoor unit 52 communicate with each other.
  • the refrigerant compressed by compressor 53 becomes high-temperature and high-pressure refrigerant, passes through four-way valve 54, and is sent to indoor unit 52.
  • the high-temperature and high-pressure refrigerant enters indoor heat exchanger 57, radiates heat by exchanging heat with indoor air, and is cooled. Thereby, the refrigerant is condensed and becomes high-pressure liquid refrigerant.
  • the room air is heated through heat exchange with the refrigerant to heat the room.
  • the refrigerant is sent to decompressor 56, and is decompressed in decompressor 56 to become low-temperature and lowpressure two-phase refrigerant, which is sent to outdoor heat exchanger 55.
  • outdoor heat exchanger 55 the refrigerant exchanges heat with the external air and evaporates, and returns to compressor 53 via four-way valve 54.
  • air conditioner 200 of the present exemplary embodiment in heat exchanger unit 60 constituting the indoor unit, the heat exchange efficiencies of heat exchangers 1a, 1b are equalized without variation. Therefore, the temperature of cool air or hot air blown out of air outlet 61 can be made substantially uniform in the width direction of the air outlet. For this reason, even when the fin-stacked heat exchangers are used as heat exchangers 1a, 1b, the temperature unevenness of the blown air is reduced, and highly reliable and high quality air conditioner 200 can be obtained.
  • the fin-stacked heat exchangers as heat exchangers 1a, 1b, it is possible to reduce the diameter of refrigerant flow channel 31 and increase the number of paths of refrigerant flow channel 31. Thereby, the heat exchange efficiency of heat exchangers 1a, 1b can be increased, and high-performance air conditioner 200 with high energy saving can be obtained.
  • any one of heat exchanger units 100, 110 shown in the first and second exemplary embodiments is used for indoor unit 52.
  • a configuration in which such a heat exchanger unit is used for at least one of outdoor unit 51 and indoor unit 52 is also acceptable.
  • the heat exchange efficiency can be improved in at least one of outdoor heat exchanger 55 and indoor heat exchanger 57, and the energy saving performance of air conditioner 200 can be improved.
  • FIG. 12 is a diagram showing an arrangement configuration of a heat exchanger of an air conditioner according to the third exemplary embodiment.
  • first pipe 6 and second pipe 7 of a plurality of heat exchangers 1a, 1b in indoor unit 52 of air conditioner 200 will be described.
  • first pipe 6 and second pipe 7 of one heat exchanger 1 of heat exchangers 1 (1a, 1b) are disposed in projection range W where header region H in which upstream header flow channel 28 and downstream header flow channel 29 of heat exchanger 1 are disposed is projected to a plane perpendicular to a direction substantially parallel to air flow B (see FIGS. 10 and 12 ).
  • first pipe 6 and second pipe 7 of one heat exchanger 1 of heat exchangers 1 (1a, 1b) may be disposed in projection range W where header region H in which upstream header flow channel 28 and downstream header flow channel 29 of heat exchanger 1 are disposed is projected to a plane that is vertical and is parallel to the first direction.
  • first pipe 6 and second pipe 7 of heat exchanger 1 are arranged in above-described projection range W of header region H in which at least one of upstream header flow channel 28 and downstream header flow channel 29 is provided.
  • a distribution part distributed 4 or branch pipe 9 that distributes the refrigerant to first pipe 6a and first pipe 6b
  • a merging part merging unit 5
  • first pipe 6 and second pipe 7 are positioned in a downstream range of header region H (behind header region H) where upstream header flow channel 28 and downstream header flow channel 29 are provided and that is not subjected to heat exchange, of heat exchangers 1a, 1b. Accordingly, it is possible to minimize a decrease in the heat exchange efficiency caused by first pipe 6 and second pipe 7 crossing air passage 62 (airflow obstruction).
  • heat exchange efficiency of heat exchangers 1a, 1b can be utilized to obtain high-performance air conditioner 200 with high energy saving.
  • first pipe 6 and second pipe 7 that cross air passage 62 only need to be piped within projection range W of header region H, and the diameters of first pipe 6 and second pipe 7 can be increased to projection surface range W of header area H. Therefore, when heat exchanger 1 is used as a condenser, first pipe 6 and second pipe 7 can function as a liquid pool for the refrigerant.
  • the arrangement positions of first pipe 6 and the second pipe 7 are within projection surface range W of header region H in which both upstream header flow channel 28 and downstream header flow channel 29 are provided.
  • the arrangement positions of first pipe 6 and the second pipe 7 may be within projection surface range W of header region H where either one is provided.
  • the present disclosure is directed to a heat exchanger unit that equalizes heat exchange efficiency of respective heat exchangers connected in parallel and exhibits good heat exchange performance, and a high performance and high energy-saving air conditioner using the heat exchanger unit. Therefore, the present invention can be applied to various heat exchangers and air conditioners such as an air conditioning apparatus for home and commercial use.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Air Filters, Heat-Exchange Apparatuses, And Housings Of Air-Conditioning Units (AREA)
  • Details Of Heat-Exchange And Heat-Transfer (AREA)

Claims (7)

  1. Wärmetauschereinheit, die eine Vielzahl von Wärmetauschern umfasst, wobei jeder der Vielzahl der Wärmetauscher umfasst:
    ein erstes Rohr, in das Kältemittel strömt;
    einen ersten Sammlerströmungskanal, der mit einer Ausflussseite des ersten Rohrs in Verbindung steht;
    einen zweiten Sammlerströmungskanal, der stromabwärts des ersten Sammlerströmungskanals angeordnet ist;
    eine Vielzahl von Kältemittelströmungskanälen, die es dem ersten Sammlerströmungskanal und dem zweiten Sammlerströmungskanal ermöglichen, miteinander in Verbindung zu stehen; und
    ein zweites Rohr, das mit einer Ausflussseite des zweiten Sammlerströmungskanals in Verbindung steht,
    wobei die Wärmetauschereinheit ferner umfasst:
    ein Verteilungsteil, das das Kältemittel auf das erste Rohr in jedem der Vielzahl der Wärmetauscher verteilt;
    ein Zusammenführungsteil, das das Kältemittel aus dem zweiten Rohr in jedem der Vielzahl der Wärmetauscher zusammenführt;
    einen ersten Strömungsraten-Einsteller, der an dem ersten Rohr in mindestens einem der Vielzahl der Wärmetauscher vorgesehen ist;
    wobei die Wärmetauschereinheit gekennzeichnet ist durch einen zweiten Strömungsraten-Einsteller, der an dem zweiten Rohr in mindestens einem der Vielzahl der Wärmetauscher vorgesehen ist.
  2. Wärmetauschereinheit nach Anspruch 1, wobei
    jeder der Vielzahl der Wärmetauscher ein Plattenrippen-Stapel-Wärmetauscher mit einer Vielzahl von Plattenrippen ist,
    jede der Vielzahl der Plattenrippen zwei gestapelte Plattenteile umfasst, und die Vielzahl der Kältemittelströmungskanäle aus einer eingedrückten Nut gebildet ist, die auf mindestens einem der beiden Plattenteile ausgebildet ist, und
    jede der Vielzahl der Plattenrippen einen Sammlerbereich aufweist, in dem mindestens einer von dem ersten Sammlerströmungskanal und dem zweiten Sammlerströmungskanal angeordnet ist.
  3. Wärmetauschereinheit nach Anspruch 1 oder 2, wobei ein Verteiler an dem Zusammenführungsteil vorgesehen ist.
  4. Wärmetauschereinheit nach Anspruch 1 oder 2, wobei
    ein Abzweigrohr an dem Zusammenführungsteil vorgesehen ist, und
    ein Drosselrohr mit einem Rohrdurchmesser, der kleiner ist als ein Rohrdurchmesser an einer Einlassöffnung des Abzweigrohrs, stromaufwärts des Abzweigrohrs vorgesehen ist.
  5. Klimagerät, umfassend
    eine Inneneinheit; und
    eine Außeneinheit,
    wobei mindestens eine von der Inneneinheit und der Außeneinheit die Wärmetauschereinheit nach einem der Ansprüche 1 bis 4 enthält.
  6. Klimagerät nach Anspruch 5, wobei
    die Inneneinheit umfasst:
    ein Gehäuse;
    die Wärmetauschereinheit, die in dem Gehäuse angeordnet ist;
    einen in dem Gehäuse ausgebildeten Luftdurchgang; und
    einen Luftauslass, der an einer Auslassöffnung des Luftdurchgangs angeordnet ist, und
    die Vielzahl der Wärmetauscher der Wärmetauschereinheit nebeneinander in dem Luftdurchgang entlang einer ersten Richtung angeordnet sind, die den Luftdurchgang kreuzt.
  7. Klimagerät nach Anspruch 6, wobei
    das Verteilungsteil und das Zusammenführungsteil außerhalb eines Endes, in der ersten Richtung, der Vielzahl der nebeneinander angeordneten Wärmetauscher angeordnet sind, und
    in jedem der Vielzahl der Wärmetauscher das erste Rohr und das zweite Rohr in einer Projektionszone des Sammlerbereichs angeordnet sind, die auf eine Ebene projiziert wird, die senkrecht zu einer Richtung der durch den Luftdurchgang strömenden Luft ist, oder auf eine Ebene, die vertikal und parallel zu der ersten Richtung ist.
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US11274863B2 (en) * 2017-09-29 2022-03-15 Daikin Industries, Ltd. Air conditioning system
JP7414961B2 (ja) * 2020-03-23 2024-01-16 三菱電機株式会社 室内機および空気調和機
KR102620053B1 (ko) * 2021-06-24 2024-01-02 한국원자력연구원 열교환기 및 이를 구비하는 원전
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BE837884A (fr) 1976-01-23 1976-05-14 Centre Rech Metallurgique Perfectionnements aux dispositifs de refroidissement des profiles metalliques
JPS52115029A (en) * 1976-03-24 1977-09-27 Hitachi Ltd Automotive air conditioner
JPS6093871U (ja) * 1983-12-01 1985-06-26 三洋電機株式会社 冷凍装置
JPH10141712A (ja) * 1996-11-06 1998-05-29 Shinko Kogyo Co Ltd ファンコイルユニットの配管系構造
JP2000055510A (ja) * 1998-08-05 2000-02-25 Mitsubishi Heavy Ind Ltd 流体分配装置及びそれを備えた空気調和装置
GB2405688A (en) * 2003-09-05 2005-03-09 Applied Design & Eng Ltd Refrigerator
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JP2008116102A (ja) * 2006-11-02 2008-05-22 Denso Corp 冷却用熱交換器
CN104285116A (zh) * 2012-04-26 2015-01-14 三菱电机株式会社 换热器、室内机和制冷循环装置
WO2013161038A1 (ja) * 2012-04-26 2013-10-31 三菱電機株式会社 熱交換器及び熱交換方法
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